Biggest one left in Glasgow is actually pretty good, it's called Guitar Guitar and is on the Trongate which is actually on the way to the Barrowlands. Fair enough, it's mostly guitars, not sure what instrument you play...

Drinking wise, Sleazy's and Mono that capt_oats suggested are good shouts. I'd also recommend republic bier halle which just off Buchanan St across from TGI fridays, they do hundreds of different beers and 2 for 1 pizza's that are incredible!

Best not to drink in the bars around the Barrowlands as they're all old firm football pubs and a few of them can be a bit rough. Get drinking in town then you can either walk down to the venue or get a taxi.